Studies of $$\mathrm B ^*_\mathrm s2(5840)^0 $$Bs2∗(5840)0 and $$\mathrm B _\mathrm s1(5830)^0 $$Bs1(5830)0 mesons including the observation of the $$\mathrm B ^*_\mathrm s2(5840)^0 \rightarrow \mathrm B ^0 \mathrm K ^0_\mathrm S $$Bs2∗(5840)0→B0KS0 decay in proton-proton collisions at $$\sqrts=8\,\text TeV $$s=8TeV